On 22 Jun '08, at 9:13 AM, Jeff LaMarche wrote:
Whatever the object is, it will be converted to a string for display, but the table view is actually capable of holding different types of data and doesn't change the type that it's holding, so you can't assume that the object it holds is a string.
Specifically, the object you get comes from the table cell for that column, and is of whatever value type that cell class uses. It depends on the type of cell.
This is the same situation as the more common - objectValueForTableColumn: method, but in reverse. In that method you have to return an object that will be stored as the object value for the cell, so it has to be a type that cell can work with. In the - setObjectValue: method, the cell returns you a value of its native type, and you have to work with it.
Here are a few examples to give you an idea of what object classes the various cells will give you. The documentation for each NSCell subclass will describe this.
text field — NSString [unless you've attached an NSNumberFormatter or NSDateFormatter, in which case it's an NSNumber or NSDate] checkbox or other NSButton — NSNumber with a boolean value, corresponding to the -state property
slider — NSNumber pop-up menu — NSNumber (the index of the selected item) image — NSImage —Jens
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